IPython suspend/foreground garbage characters

Hello,

I recently upgraded from an ancient but highly customized ipython to 5.3.0 on linux (5a894b9). The issue of the moment that I can't see to figure out is if I suspend my ipython session (ctrl-z) and then resume it (fg), I get some junk characters printed on the command-line each time. It looks like this:

```
machine: /home/ixarka$ fg
ipython --profile=ixarka
In [1]: ^[[118;1R
```

It looks like some escape sequence and it's those same ^[[118;1R characters each time. My TERM is set to xterm and I'm logged in with putty.

Any idea what it could be? I frequently suspend/resume python, so this is driving me insane :)